I used a piece of "Unistrut/Superstrut" across the rafters to hang my hoist.
If those 'L' brackets holding the unistrut together cause any issues, they do make a "T" bracket specifically for joining the two pieces like that. It is a little beefier than the L brackets.
I like the round flange you used for the cable hole. I ended up just using some door casing to trim mine out.